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# Table 8 Model statistics of the misfit between CHAOS-7 and other field models and 30448 vector triples of ground observatory SV (annual differences of revised monthly mean) data, between 1997.5 and 2019.5

From: The CHAOS-7 geomagnetic field model and observed changes in the South Atlantic Anomaly

Misfit to SV at ground observatories | ||||||||
---|---|---|---|---|---|---|---|---|

CHAOS-7 | CM6 | A20 | MCO_SHA_2Y | |||||

Mean | rms | Mean | rms | Mean | rms | Mean | rms | |

\(\text {d}B_r/\text {d}t\) (nT/year) | 0.11 | 3.73 | − 0.05 | 3.84 | 0.14 | 3.81 | 0.11 | 3.88 |

\(\text {d}B_\theta /\text {d}t\) (nT/year) | − 0.21 | 3.59 | − 0.27 | 3.67 | − 0.12 | 3.66 | − 0.12 | 3.51 |

\(\text {d}B_\phi /\text {d}t\) (nT/year) | 0.01 | 3.31 | − 0.03 | 3.32 | 0.00 | 3.32 | 0.03 | 3.31 |